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We have an entire course teaching Spanish (Latin America) grammar and vocabulary.
Questions & Answers about Los estudiantes están de pie.
Why does de pie mean "standing" when pie means "foot"?
You are right that pie means "foot"! In Spanish, the fixed expression de pie literally translates to "of foot," but it is the standard way to describe the state of "standing up."
Since there are multiple students, shouldn't it be pluralized to de pies?
Why do we use están instead of son here?